Avocet ALTIMETER 50 Manual - Página 5

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bicycle is transported. The wheel must be turning before the

Altimeter 50 will accumulate altitude.

Non-Climb Altitude Changes.

designed to disregard dips in the road of 30 feet or less.

When you start a ride, the first gain will not be recorded until

you exceed 30 feet; then subsequent gains will be added in

10 foot increments. If the trip and total climb displays

accumulated every small change in altitude, their informa-

tion would not be meaningful. Minor rises and depressions

in the road, and atmospheric variations, would add to the

trip and total climb readings and obscure the true altitude

gain.

Accuracy.

Although the Altimeter 50 is temperature

compensated, large, rapid temperature changes can affect

the altitude reading by up to 70 feet. Within a few minutes

the altimeter will stabilize variations such as those caused by

taking the unit outside from a heated room in winter. Wind,

rain, and humidity do not affect altimeter accuracy. Atmos-

pheric pressure changes during a ride will affect the dis-

Tie

Mounting Bracket

Tools.

A small screwdriver, scissors, and a wrench

to remove the front wheel if it does not have a quick

release hub.

Spoke

Crossing

Transmitter–Cable Tie Method.

not snap on the hub flange, cut off its prongs. Attach it

to the three nearest spoke crossings with cable ties.

Center the ring while gradually tightening the ties. Trim

the tie ends and reinstall the wheel. A rear wheel

transmitter kit is also available separately.

A B O U T T H E A L T I M E T E R

played altitude by less than 50 feet and the amount of

accumulated altitude change by less than 1%.

The Altimeter 50 is

Climb accumulated on a steady grade will have less

than a 1% error. Two riders covering identical rolling

courses may note up to a 4% difference in accumulated

climb–one Altimeter may just detect a dip that another

misses because it started measuring from a different point.

What You Will See.

climb or descent, the actual gain or loss will usually be

what you expect. On hilly rides you may be surprised at

the amount of climbing you have done. On flat rides, even

if there are highway underpasses and undulations in the

road, you will record very little climb. While you ride, if

you compare altitude with another Altimeter, the readings

will track each other within 50 feet.

Using the Altimeter 50 as a Barometer.

the Altimeter 50 is kept in one location, an altitude gain

indicates lower barometric pressure; an altitude loss

indicates higher pressure. Each 10 foot change on the

Altimeter equals .01 inches of mercury on the barometer.

I N S T A L L A T I O N

Transmitter

Receiver

prong transmitter ring supplied snaps on the right hub

flange of most 36 spoke wheels. For 32 spoke wheels,

use a 4-prong transmitter available separately, or

attach with ties (see next section). Reinstall the wheel.

I N S T A L L A T I O N

Tie

If the ring does

its jaw over the narrowest part of the fork tip. Adjust the

receiver so that it is as close as possible to the transmit-

ter. Thread a cable tie through the hole in the mounting

jaw and around the fork. Pull it very tight and trim the

excess.

When you measure a familiar

Transmitter

Prong

Transmitter.

Remove the front wheel. The three-

Tie

Receiver.

With the receiver in front of the fork, slip

When

Hub Flange

Receiver